Since GVE is for Premier anyway, provisioning GVE with 2nd number makes sense. This number will not have Ooma VM setup so at least that would be an inconvenience for how Ooma is normally setup if main number was used.

IMPORTANT: You should not tell anyone your GVVN. This is a hidden phone number that should only be used to route calls from your Google Voice account to your Ooma device. It is not meant to be used to receive regular phone calls, and will not work properly if it receives direct calls.